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Many DIY guides say to use anti-seize on the spark plug threads. Both Bosch and NGK say NOT to use it on their spark plugs, since they already treat the threads and additional anti-seize leads to over-torquing. I suspect all manufacturers do this now,

Many DIY guides say to use anti-seize on the spark plug threads. Both Bosch and NGK say NOT to use it on their spark plugs, since they already treat the threads and additional anti-seize leads to over-torquing. I suspect all manufacturers do this now,

Since the spark plugs have such a long service life (80k+ miles), I have always used a LIGHT coating of anti-seize on the threads, just to help ensure that the spark plugs do not seize to the aluminum cylinder head. To avoid over-torquing, I torque to a couple of foot-pounds (10%) less than the dry torque specification.